- 1 frozen pound cake (10 3/4 ounces) in aluminum loaf pan, unthawed, or 1 homemade 4 1/2-by-8 1/2-inch pound cake (homemade pound cake recipe), room temperature
- 2 cups raspberry sorbet, softened
- 1 cup vanilla ice cream, softened
- 1/2 cup coarsely chopped chocolate wafer cookies
- 2 large egg whites
- Cream of tartar
- 1/2 cup sugar
- 1/2 teaspoon pure vanilla extract
- Remove cake from pan and cut horizontally into 4 slices. Line pan with plastic wrap, leaving 6-inch overhang on two sides. Build cake layers in pan in this order: bottom cake slice, 1 cup sorbet, cake slice, 1/2 cup ice cream, cookie crumbs, 1/2 cup ice cream, cake slice, 1 cup sorbet, top cake slice. (If necessary, return ice cream to freezer as you work.) Wrap in plastic and freeze at least 1 hour (or up to 3 days).
- In a heatproof bowl, lightly whisk together egg whites and pinch of cream of tartar. Set bowl over (not in) a pan of simmering water and whisk until whites are foamy. Slowly whisk in sugar and cook, whisking, until sugar is dissolved (to test, rub some between your fingertips).
- Remove bowl from heat and, with an electric mixer, beat on medium-high until stiff, glossy peaks form, about 6 minutes. Add vanilla and beat 1 minute. Remove cake from pan, trim sides if desired, and dollop meringue on top.